williams



(No Model.) l

. G. W. WILLIAMS.

COPYING PRESS. No. 338,625. 'PatentedMw 23.188,6.

UNITED STATES PATENT OFFICE.

GEORGE W. WILLIAMS, OE CHICAGO, ILLINOIS, AssIGNOR rIO AARON WILLIAMS,OE sAME PLAGE.

COPYING-PRESS.

SPECIFICATION forming part of Letters Patent No, 338,625, dated March23, 1886.

Application filed September 10l 1884. Serial No. 142,550. (No model.)

To all whom, it may concern:

Be it known that I, GEORGE W.WILLIAMs, of Chicago, county of Cook, andState of Illinois, have invented certain new and useful Improvements ina Copying-Press, of which the following is a full, clear and exactdescription that will enable others to make and use the same, referencebeing had to the accompanying drawings, forming a part of thisspecification.

This invention relates to an improvement on Letters Patent No. 301,418,granted to me July 1,1884; and it consists of certain novel features inthe construction. combination, and Operation of parts, as will behereinafter Inore fully set forth and claimed.

Fig. 1 is aview in perspective of a copying press embodying myimprovements, and Fig. 2 a side elevation and partial section of thesame.

Referring to the drawings, A represents the bed of the press; B, thearched bridge, and C the platen.

The longitudinal center of l:he arched bridge Bis provided with thevertical elongated chamber D, which is open at the lower end for theinsertion of the spiral spring E and the Vertical compressing-bolt F,inelosed therein. The bolt F passes up through the center of the chamberD,and is encircled by said spring, as shown in Fig. 1.

The upper projecting end of the bolt F is threaded, while the lower orheaded end is of a conical form, terminating with the enlarged flattenedknob a, which bears on the center top of the platen, and has a swivelingengagementtlierewith. Theannularshoulder a on the bolthead is of asufficient diameter to close the lower end of and form a movable bottomfor the cylindrical chamber D, and at the same time provides acompressingbearing for the spring E, the upper end of said springbearing against the inside top, ai, of said chamber.

The platen Gis provided with the curved lugs d d', which rise up on eachside of the lower end of the bolt F, projecting over and engagingloosely with the upper side of the knob, as shown in the drawings, thusdetaehably securing the platen and bolt in proper relation to eachother, and allowing the platen sufficient play to adjust itself andconform to the work.

The lever-handle G is provided with the threaded nut H, which is adaptedto engage with the upper correspondingly-threaded end of the bolt F.This nut has a bearing on top of the chamber D when the lever-handle Gis turned down, which operating has the effect of drawing up the bolt,raising the platen from the bed of the press,and compressing the springin the chamber. Now, by turning the lever-handle upward and letting thesame swing free on the bolt F, the spring E automatically imparts therequired downward pressure to the platen. By this arrangement but littlepower is required to be applied to the lever-handle to compress thespring and raise the platen, to insert or remove the copying matter.

It is of course obvious that different styles of springs may be used;and, if preferred, the spring and parts may be so arranged that thespring will expend its power in the opposite direction and raise theplateninstead of forcing it down.

Having thus described my invention, what I claim,and desire tO secure byLetters Patent, 1s-

In a copying-press, the combination, with a bridge provided centrallywith a chamber` of a spring inclosed in said chamber, an invertedscrew-threaded bolt passing vertically through said chamber and providedwith a shoulder forming a movable bearing for the lower end of saidspring, a platen provided on the upper side with curved lugs adapted toengagewith the lower headed end of said bolt, and a lever-handle havinga threaded engagement with the upper end of said bolt, all combined andarranged to Operate as and for the purpose set forth.

GEORGE NV. VILLIAMS.

Vitnesses:

J. P. DONALsoN7 V. STANWOOD.

